[Lowfer] WMS on May 16
JD
listread at lwca.org
Tue May 17 02:03:21 EDT 2011
This is what WMS looked like here in the early morning, after all the QRN
disappeared. It was as quiet as mid-winter for a few hours. Hurrah!
This capture told me two things:
(1) I need a more climate controlled environment for my receiver than the
car can provide. It was down to 40 both outside and inside the car at
sunrise. But when I parked out there again less than two hours later, the
sun heated the interior faster than I could move air through the passenger
compartment, so there's a fair amount of drift visible as the air
temperature passed through a change of about 40 degrees Fahrenheit.
(2) I need to get busy and finish my buffer amp, so I won't have the
current 10 db or so of loss from antenna mismatch. It started out as a very
simple project, but feature creep set in, as always. (Now it's to become a
distribution amp as well, so I can run more than one receiver at a time.)
With the atmospheric noise temporarily gone, the limiting factor in copying
WMS was clearly the receiver's internal noise. Eliminating that mismatch
would have given me absolutely stunning copy, maybe even by ear. At this
time of year, QRN is most generally the limiting factor--but as this morning
showed, not always!
John
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